| verb | start abruptly “After 1989, peace broke out in the former East Bloc” |
| verb | erupt or intensify suddenly “Unrest erupted in the country” |
| verb | start to burn or burst into flames “Marsh gases ignited suddenly” |
| verb | break out “The tooth erupted and had to be extracted” |
| verb | become active and spew forth lava and rocks “Vesuvius erupts once in a while” |
| verb | force out or release suddenly and often violently something pent up “break into tears” |
| verb | appear on the skin “A rash erupted on her arms after she had touched the exotic plant” |
| verb | become raw or open “He broke out in hives” |
| eruption | noun | a sudden violent spontaneous occurrence (usually of some undesirable condition) |
| irruption | noun | a sudden violent spontaneous occurrence (usually of some undesirable condition) |
| flare-up | noun | a sudden intense happening |
| ignitible | adjective | capable of burning |
| ignitable | adjective | capable of burning |
| ignition | noun | the act of setting something on fire |
| combustible | adjective | capable of igniting and burning |
| combustive | adjective | supporting combustion |
| extravasation | noun | (of volcanos) pouring out fumes or lava (or a deposit so formed) |
| eruptive | adjective | actively spewing out lava |